. >> reporter: he says the islamic radical group boko haram held the girls nearby but nobody came to help. >> they come for them. no helping hands for a good 11 days. >> reporter: the slow response has been replaced by international outcry and mobilization. eight u.s. military personnel arrived in nigeria on friday, another seven travel this weekend. >> really, the nigerian government will allow them to walk and take our daughters. >> reporter: criticism has been leveled at all sides. amnesty international says the military had at least four hours of advance warning. >> they had warning that this -- that this school was under threat, and nothing was done to save these girls. >> reporter: the government says it is doing all it can, but worries the girls are being used as human shields. >> we've got to be very careful. if a group of these are holding 200 children, itnot the kind of place you go bombing. >> reporter: even the nigerian government says it struggles to control the insurgency. it's not just nigeria's problem, it's cameroon's as well. in the last week there have been two att